RE: Seagull Model Cessna 337 ARF
 

Are the retracts a reality for purchase ?

RE: Seagull Model Cessna 337 ARF
 

RCSpectator, Thank you for dropping by and showing us pics of your friends Skymaster. It looks great with the gear up. Now we know of two that have flown. ;)


Well, I haven't been on here in a while so I thought I would check in. I made the trip to the Toledo RC Expo this weekend and Horizon had a Seagull Skymaster on display. I looked it over for some of the problem areas that we had found and they had cleverly hidden the rear cowl fit by screwing it down tight. Still, it was off quite a bit and I just smiled to myself and moved along. ;) Hope everyone's builds are going good. I figure we will start hearing of more maidens soon.

As for the Red Bull Skymaster, it is nearly complete. We still have a little radio gear to mount and need to finish the rear exhaust, but it's mostly done. It's been put to the side so I can work on other projects, but can be ready to go in a weekend at this point. We will wait until we get our field rolled and mowed nice and smooth before we fly this one. Oh yeah, we won first in our class at our Static Show! :D I have pics, but the uploader doesn't seem to be working for me right now. Will try again shortly.

RE: Seagull Model Cessna 337 ARF
 

I can't wait to see the some video of these planes fly! I love the Cessna 336/337 and all of you have brought that passion back. The Redbull looks great. Keep this thread alive.

I would like to see more on the retracts if anyone can get more information on them, those are impressive.

RE: Seagull Model Cessna 337 ARF
 

Adam;
Congrat on the first place win in your class at the Static Show. It's to bad you did not have it at Toledo R/C Expo this year. I know it would have turn heads at the show. I have yet to maiden my C-336, because I had to finish a Top Flite Spitfire I was building. Hope to do it in the next two weeks. All the ground test has been done and I found I run the back engine no more than 3 min before it heat up. I still want to find out if we need to go with 2 elevator servo or is the one we have now is enough. Will be back soon with my flight report and I hope I can get some video of her in the air!!!
Sonny
aka
jet22b

RE: Seagull Model Cessna 337 ARF
 

Well I guess the mystery of the 337 retracts continues:eek:

RE: Seagull Model Cessna 337 ARF
 

OK, it looks like RCU is working now so I'll try this again...

http://i1279.photobucket.com/albums/...psdcbbf9f1.jpg

http://i1279.photobucket.com/albums/...psfaff20a9.jpg

http://i1279.photobucket.com/albums/...psed322d09.jpg

http://i1279.photobucket.com/albums/...ps764d7a35.jpg

http://i1279.photobucket.com/albums/...ps139e4fd2.jpg

http://i1279.photobucket.com/albums/...ps0ea47005.jpg

http://i1279.photobucket.com/albums/...ps15854438.jpg

RE: Seagull Model Cessna 337 ARF
 

Adam;
She looks good!!!!! It is too bad it was not at Toledo R/C Expo, it would have been a hit!!! Hats off to you and your team!! When you take her to the field, I know heads will turn!!!
Now I will be more than happy to take her off of your hands!!! Just kidding!!!!:D
Sonny
aka
jet22b

RE: Seagull Model Cessna 337 ARF
 

HERC, That look's Great !!!

RE: Seagull Model Cessna 337 ARF
 

HERC

That is outstanding!!!!!! I believe all would agree, we need some video of that bird flying!!!! Can't wait to hear how she flies.

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RE: Seagull Model Cessna 337 ARF
 

Cal Orr Cessna Type Retracts.

I received an email from Cal that I will try to share here. Cal is an engineer who has done a lot of work out of the country, Budapest HU and when he can some modeling.


Hello Jim
I have attached3 <span class="ecxsquiggly" title="To see spelling suggestions, click this word">Skymaster</span> pictures, under construction that you may post. I do not have any pictures of the "final" install of the mains, I will take some when I return.
The first picture is a full scale <span class="ecxsquiggly" title="To see spelling suggestions, click this word">skymaster</span> I found in a bone yard and looked it over. This was a fun and educational day that ended up with me sitting in the pilots seat making airplane noises.
The 2nd picture shows the nose wheel-well built on the frontfirewall and you can see the cowl with its cutout on the left. Also note the mounting of the electric motor, I don't make boxes etc. but use 6-32 all-thread. The all-thread allows me to position the motor where I want it and also to set the offset if needed. I have used this mounting method on several models and its the only way to go.
The 3rd picture is with the front cowl on. Note the curved gear doors next to the sanding block.
The full scale <span class="ecxsquiggly" title="To see spelling suggestions, click this word">skymaster</span> retracts the nose wheel forward and rotates it as it retracts. I retracted it forward but did not rotate it. To retract forward, I installed the retract unit backward which caused some problems with the nose wheel steering that had to be worked out. Note these picturesshow an early version with the curved gear doors. To make the curved gear doors work it was necessary to make each door (left/right) operate one at a time and they needed to open almost 180 degrees instead of just 90 degrees.............and the curve itself allowed the prop blast to try to close the doors. Because of these problems I built the "chin" (shown in previous pictures) which allowed for two straight doors each opening about 90 degrees, each operated by its own servo.
When adding retracts to any model, I always start with the nose wheel. This will set the prop clearance and the height of the model off the ground. Don't over do it with the prop clearance, it is always easier to retract short struts than longer ones. Look at the full scale <span class="ecxsquiggly" title="To see spelling suggestions, click this word">skymaster</span> picture, there is about one tire diameter distance between the top of the tire and the bottom of the fuselage. The Seagull <span class="ecxsquiggly" title="To see spelling suggestions, click this word">Skymaster</span> has the model too high off the ground! Lower to the ground makes for better ground handling also. AND if you are flying off of a hard surface, buy wheels that are as hard as you can buy, the model will track much better down the runway!
I need to take some pictures of the mains installation etc. etc. You can make the retract system from parts in your hobby store and lots of time. The trick is the struts and if you did everything else correct, the left and right struts will be the same. It is all worth itwhen you see it operate - more to come.
The airplane itself is powered by two <span class="ecxsquiggly" title="To see spelling suggestions, click this word">eFlite</span> <span class="ecxsquiggly" title="To see spelling suggestions, click this word">15's</span> with <span class="ecxsquiggly" title="To see spelling suggestions, click this word">APC</span> <span class="ecxsquiggly" title="To see spelling suggestions, click this word">10X7E</span> props. Each motor is powered with its own 4 cell 3000 <span class="ecxsquiggly" title="To see spelling suggestions, click this word">mah</span> battery. You can use bigger motors whichmeans bigger <span class="ecxsquiggly" title="To see spelling suggestions, click this word">ESC's</span>, biggerbatteries, more weight and more$$$. The rear motor has the propeller on backward and is reversed. This means the front/rear motors spin the same direction (I still have torque)and it sounds really good in the air, like blowing into a fan. <span class="ecxsquiggly" title="To see spelling suggestions, click this word">APC</span> does not make a <span class="ecxsquiggly" title="To see spelling suggestions, click this word">10X7E</span> pusher, so the numbers worked out better this method. <span class="ecxsquiggly" title="To see spelling suggestions, click this word">APC</span> does make<span class="ecxsquiggly" title="To see spelling suggestions, click this word">10X6</span> gas props and a <span class="ecxsquiggly" title="To see spelling suggestions, click this word">10X6</span> gaspusher that I may try but the loss in RPM (andpower) with the thicker prop material and getting the same RPM with less pitch does notwork for me.
I have two <span class="ecxsquiggly" title="To see spelling suggestions, click this word">ECS's</span> in the model each with a 5.5 volt <span class="ecxsquiggly" title="To see spelling suggestions, click this word">BEC</span>. The front<span class="ecxsquiggly" title="To see spelling suggestions, click this word">BEC</span> powers a receiver in the fuselage that operates the retracts/doors, nose wheel steering, right aileron and right elevator half (I cut the elevator in half and operate each half with its own servo). The 2nd receiver is in the wing and is poweredfrom the rear ESC. The wing receiver operates the left aileron, left elevator half, both rudders and both flaps (by the way, the full scale <span class="ecxsquiggly" title="To see spelling suggestions, click this word">skymaster</span> has 4 flaps). This installation means I only have 3 servo cables between the fuselage and wing and gives me some redundancy, just bind both receivers at the same time.
To date I only have 2 flights on the Seagull<span class="ecxsquiggly" title="To see spelling suggestions, click this word">Skymaster</span>, the two flights you saw before my trip as the sun was setting. We can get better pictures, in focus with more light. I am happy with the airplane, it fly's scale, sounds good and looks great with the gear up. I may try different props and I may also play with the nose wheel and reduce the size of that chin on the nose.
I have started a Cessna 182 <span class="ecxsquiggly" title="To see spelling suggestions, click this word">RG</span> with the same type of retracts. This project will be easier as there are not the gear doors to sequence in.
While it has beena few years sinceI have written for a model magazine, I have hademails with Debra of Model Airplane News and may also do an article for her, a how too. "Cessna Type Retracts"
My work interfered with the Toledo show as I had hoped to have the <span class="ecxsquiggly" title="To see spelling suggestions, click this word">Skymaster</span> there, but I may have the model at the RC expo in Long beach in June.
Hope to fly soon
Cal Orr

RE: Seagull Model Cessna 337 ARF
 

Beautiful Adam!!!

RE: Seagull Model Cessna 337 ARF
 

Thanks for sharing your letter I guess the big question is how much restructuring in the fuselage is needed to make it work

RE: Seagull Model Cessna 337 ARF
 

I try again, Upload pictures for post #260</p>

RE: Seagull Model Cessna 337 ARF
 

Good ole RCU

RE: Seagull Model Cessna 337 ARF
 

I built a great planes F-14 Tomcat back in the day, and it used mechanical retracts that operated just like we need on this model (at least to sport scale standards). Standard mechanicals that were mounted at a compound angle... it was a great setup on the Tomcat. I remember back in the day even thinking I would use the layout on a Royal Skymaster someday, heh heh.

After seeing a full scale one of these disassembled in our shop once, I think scale retracts are not as hard as some make them out to be. They simply pivot on a hinge that is 45 degrees from the centerline of the fuselage instead of being parallel to it.

The retracts do look good on the model! A lot of work went into that mod. Great work.

RE: Seagull Model Cessna 337 ARF
 

This is a very interesting plane indeed....
I had no idea that the full-scale planes had retractable gear!!! WOW....

It wasn't until I saw the Red Bull Cessna 337 and thought??? What happened to the gear?????

This is correct.... The gear merely pivots at an angle.... Very reliable when setup right...

I would go as far as saying, it is one of the odd ball looking planes but.... I really like the looks....

Seagull would sell many more if dif. scheme and detailed gear... but for the price, you can't beat it....

What really sets this plane off is the Multiple color schemes that are available.... talk about cool!
Some picts...

It would be really nice to see a 30cc size or 50cc.... That was done up with scale features and lines....
made a ARF...

RE: Seagull Model Cessna 337 ARF
 

Sonny,  have you maidened her yet?   Has anyone?  I'm still waiting to hear about someone else's flight.  <div>
</div><div>Good luck </div><div>
</div><div>Rc flunky </div>

RE: Seagull Model Cessna 337 ARF
 

rcflunky,
Now that the weather is getting good, The Evo .46 that I have in the rear is giving me big time trouble!!! Before I could start the rear engine and it would run the tank dry. Now it will not stay running. I have change plugs so many time its not funny. Change tank location and still not running right. But take the engine out of the plane and put it in the test stand and it run like a well oil machine. Put it back into the plane and she don't want to run. I may have to buy two new Evo.46 and see what happen.
I hope you pick up one more and get back into the air soon. As soon as I get the two new engines and break them in, I will be back with a flight report!!
Sonny
aka
jet22b

RE: Seagull Model Cessna 337 ARF
 

Sonny,

Your issue is most likely cooling. Try running the rear engine with a small fan pointed at it to see if that is the case. On my last Skymaster I ran the rear engine much richer than the front.

Mark

RE: Seagull Model Cessna 337 ARF
 

Mark, thanks for the input!!! Today I found out why the engine was not running good. The rear and front bearing are shot!! Both the rear and front engine are over 5 years old, so I guess it time to buy new engine, or just buy new bearing!!!
Some people don't like the Evo engine, but I have had very good luck with them. Now to hop over to Hangar 9 website and see if Evo still make them!!!
Thanks again for the good info. I wish the web was around back in the late 60's, early 70's, when I jump into this hobby!!!
Sonny
aka
jet22b

RE: Seagull Model Cessna 337 ARF
 

From elsewhere:


[youtube]http://www.youtube.com/watch?v=w67UYBa48Lg[/youtube]


Anybody compare it with the old NitroPlanes?

RE: Seagull Model Cessna 337 ARF
 

No pictures....
I tried even typing it in...and NO GO....

I though I had some picts that worked???

RE: Seagull Model Cessna 337 ARF
 

some very nice mods have ben made on this 337 thread.
just want to coment on the low fuel tank positions

 why not leave the tanks where called for and just mount a 2 oz hopper tank to the side
of the  eng mount so that the engine only sees the fuel level fed from the hopper tank ??
 just got my box from the big brown truck and looking at the instructions .looks like i wiil really like this plane

RE: Seagull Model Cessna 337 ARF
 

Hello Just Because;
Welcome to the build thread!! The hopper tank just may work. I have yet to maiden my Sky-Master, because I have yet to break-in the new engines. Lots of good info of what we did on the build of our birds, on this thread. If you need any help or have a question, please post here.
Good luck on the build and do post pictures of your build, and if you do with the hopper tank set-up, please post pictures!!!
Thanks!!
Sonny
aka
jet22b

RE: Seagull Model Cessna 337 ARF
 

I am not very good with a computer, and to make matters worse, I am on dial-up.  I cannot post pictures, but will try to describe with words what I plan to do.  My feelings will not get hurt if someone makes a correction.  Like someone else has posted, I also am concerned about a bent wing tube if it is glued into the center section .  To make a removable wing tube I will drill a 1/4 inch hole with a frizner bit in the block of wood in front of the servo pocket.  Will glue and trim a 1/4 inch dowel to match the bottom of the block.  Will then insert metal wing tube, tape or otherwise secure in place.  Will then drill and tap a 4/40, will use a socket head screw to secure the wing tip.  Viola - removable.